White



W. H. TAYLOR.

LOCK

Patented July 28, 1891..

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(No Model.)

l/vflmaaoea UNITED STATES PATENT OFFICE.

WARREN H. TAYLOR, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE & TOW NE MANUFACTURING COMPANY, OF SAME PLACE.

LocK.

SPECIFICATION forming part of Letters Patent No. 456,917, dated July 28, 1891.

Application filed April 18,1891. Serial No. 389.,45'7. (No model.)

To all whom it may concerns Be it known that I, WARREN H. TAYLOR. of Stamford, county of Fairtleld, and State of Connecticut, have invented certain new and useful Improvements in Locks, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to that class of locks using sliding or pin tumblers, which tumblers fasten a key-cylinder or roll-back to its surrounding case until the tumblers are set by the insertion of the key, when the keycylinder can be revolved to operate the lock.

My present improvements relate to pintnmblers to be used with my improved lock of this class, in which I form a keyway with projections from its side walls extending past its center and in which I bevel or curve the tumblers at their lower ends upon either side of a central line transverse to the axis of the keyway. In tumblers suitable for such improved pin-tumbler locks it is essential that provision be made against their rotation, and I have heretofore shown means for accomplishing that object. By my present improvement, however, I have accom' plished the result in a more advantageous manner by an improved tumbler which has a cylindrical bearingsurface above the keyway, but at the point where it intersects the way the tumbler is flattened or narrowed, so that when fitted in a tumbler-chamber of corresponding shape it cannot rotate, and being rounded or beveled on two sides of a central line at its bottom its broad key-bearing surface will always be held in proper position. A considerable advantage of this form of tumbler and tumbler-chamber is that the tumbler-chamber being narrowed at its intersection with the keyway there is less space into which a picking-tool can follow a tumbler, and also as the material of the cylinder is not cut away to so great an extent between the tumblers in the keyway it increases the material, or what is technically called land, between one tumbler-chamber and another, which also adds to the difficulty of picking.

locks.

I also regard. the form of of the length of the keyway than at right angles thereto.

In the accompanying drawings, illustrating my invention, Figure 1 is a front end elevation of a pin-tumbler lock, showing my improved keyway. Fig. 2 is a longitudinal diametrical section showing the key in place. Fig. 3 is a crosssection showing one of the tumblers and its spring in elevation. Fig. 4. is a View of a tumbler detached.

Referring to the letters on the drawings,

A indicates an escutcheon or tumbler-case such as is ordinarily used in this class of The shape of the tumbler-case is not material, because this invention may be applied to looks of any other class, such as cabinet-locks, padlocks, &c.

B indicates the hub or roll-back; C, the keyway therein; D, the key; E, the pin-tumblers, and F their springs.

The tumbler-sockets extend from the escutcheon into the roll-back, as usual, and in general construction and operation my lock is similar to those of its class. The tumblers, it will be seen, are shown as flattened at G on opposite sides and are cylindrical at H. They might be flattened only on one side; but I prefer to flatten them on both sides, as shown, which may be done in any usual way familiar to metal workers.

What I claim is 1. In a look, a tumbler which is cylindrical at one end and flattened at the other end, upon which the key bears, and which flattened end is beveled or rounded from opposite sides of a central line, so as to make a wider key-bearing surface, substantially as described,

In a look, a key-cylinder or roll-back. In testimonyof' all which I have hereunto provided with tu mbler-recesses which are cysubscribed my name. lindrical in one portion and non-cylindrical in another, so that the tumbler which is fit- \VARREN H. TAYLOR. 5 ted to said recesses can move at right angles to the axis of the key-cylinder and will not \Vitnesses: revolve on its own axis, substantially as de- SOHUYLER MERRITT, scribed. G110. E.- WHITE. 

